Annual corn yield and rainfall in US cornbelt states, 1890-1927
   24.5   33.7   27.9   27.5   21.7   31.9   36.8   29.9   30.2   32.0   34.0
   19.4   36.0   30.2   32.4   36.4   36.9   31.5   30.5   32.3   34.9   30.1
   36.9   26.8   30.5   33.3   29.7   35.0   29.9   35.2   38.3   35.2   35.5
   36.7   26.8   38.0   31.7   32.6
    9.6   12.9    9.9    8.7    6.8   12.5   13.0   10.1   10.1   10.1   10.8
    7.8   16.2   14.1   10.6   10.0   11.5   13.6   12.1   12.0    9.3    7.7
   11.0    6.9    9.5   16.5    9.3    9.4    8.7    9.5   11.6   12.1    8.0
   10.7   13.9   11.3   11.6   10.4
